You did your research well. My small flock gets handled by neighborhood children in the summer as the girls are free range in the yard. When the chicks all grow up together , there is usually very little chance of fighting. It is when a newcomer is added that some issues arise . After a short time, the new ones are accepted . they usually start at the bottom of the pecking order and work their way up. HOPE THE PEOPLE ENJOY YOUR CHICKS.

Most chickens raised together as chicks will get along. I LOVE the Black Australorps! My favorite breed!! My Aussies are HUGE on lap sitting and over all friendliness. Very docile birds and great layers too. EE's make great layers and are also a docile breed. I am not sure about the temperament of the other breed you mentioned. They sure are pretty however.

I've raised Easter Eggers before, but not Orloffs or Australorps, so I can't tell you for sure if they will get along. From what I've heard, though, all of those breeds tend to be rather docile, so I think they'd probably get along well. Chickens in general are social animals that dislike being alone and rarely fight.

Out of your list, I've only had an Easter Egger, so I can't tell you how well the three breeds would get along. But, I do enjoy my Easter Egger, and would recommend Easter Eggers, as they are docile and very good layers.